Car jerky when cruising at constant speed
10-09-2008, 05:00 AM
#1
Member
Thread Starter
Join Date: Nov 2005
Posts: 36
Ok , first of all I've got a JDM S5 TII with a rebuilt motor about 5000kms ago. Everything is stock except for a street/extend port and pod filter.
I've replaced then spark plugs and ignition leads recently so highly doubt they're the problem.
Occasionally when I'm driving along at a constant speed the car starts to jerk violently. The only way to stop it is to accelerate or take my foot off the throttle.
It feels like I'm stabbing my foot on and off the throttle.
It seems as if there's an intermittent ignition problem in one of the rotors so it will fire, then not, then fire, then not etc. all within a moment. It had slowly been happening more often.
I've checked to see if the connections of the leads to the spark plugs and coils were loose.
Any help please guys. I'd rather fix this myself than take it to a shop to get fixed.
I've replaced then spark plugs and ignition leads recently so highly doubt they're the problem.
Occasionally when I'm driving along at a constant speed the car starts to jerk violently. The only way to stop it is to accelerate or take my foot off the throttle.
It feels like I'm stabbing my foot on and off the throttle.
It seems as if there's an intermittent ignition problem in one of the rotors so it will fire, then not, then fire, then not etc. all within a moment. It had slowly been happening more often.
I've checked to see if the connections of the leads to the spark plugs and coils were loose.
Any help please guys. I'd rather fix this myself than take it to a shop to get fixed.
10-10-2008, 01:26 AM
#5
Junior Member
Join Date: Sep 2008
Location: 99301
Posts: 4
Originally Posted by fc3s4utnv' post='909622' date='Oct 9 2008, 07:25 PM
Really would and o2 cause it to be that bad?
I've been having the same problem with my car for a few months. so bad now that I have to pull over on the highway. it would jerk and jerk to the piont that it would travel so slow I'd have to pull over and let traffic by me. you sound like me about two months ago. hope you aren;t headed where I am with it.lol......I think. I'm in the middle of a major overhaul I'll post pics soon.
10-10-2008, 11:35 AM
#6
Senior Member
Join Date: May 2002
Location: California
Posts: 22,465
Originally Posted by fc3s4utnv' post='909622' date='Oct 9 2008, 07:25 PM
Really would and o2 cause it to be that bad?
crusing is the only time the ecu really uses it, so if its off, it can do weird things.
10-19-2008, 09:05 PM
#8
Member
Thread Starter
Join Date: Nov 2005
Posts: 36
It's stopped doing it now. I'm waiting for it to come back and get worse. Then I'll have a look at the oxygen sensor. I was thinking it could be the TPS but that should have been set correctly when the motor was rebuilt.
02-06-2009, 02:59 AM
#9
Member
Thread Starter
Join Date: Nov 2005
Posts: 36
I bought a Bosch oxygen sensor to put in but haven't installed it yet. Is there any difference between the mazda and bosch O2 sensors? Is installing it just a matter of disconnecting the old one, unscrewing it and putting the new one in?
